Units and Symbols
What is the symbol and unit for speed?
S
m/s (meters per second)
What is the equation for work?
W = FD
What is being bonded in an ionic bond?
Metal + nonmetal
What is the formula for velocity?
v= d/t
A person pushes a box with a force of 60 N across a floor for 5 meters. How much work is done?
W = Fd
W = 60N * 5m
W = 300J
What is the symbol and unit for force?
F
N (Newtons)
What is the formula for potential energy?
PE = mgh
What is being bonded in a covalent bond?
Nonmetal + nonmetal
What is the formula for force?
F = m*a
Rockets are launched into space using jet propulsion where exhaust accelerates out from the rocket and the rocket accelerates in an opposite direction. What law is this?
Newtons 3rd law
What is the symbol and unit for Kinetic energy?
KE
J (Joules)
What is the equation for wave frequency?
Frequency = Velocity/Wavelength
What is being bonded in a metallic bond?
metal + metal
What is the definition of momentum?
A car speeds up from 5 m/s to 25 m/s in 10 seconds. What is the acceleration?
a = (Vf - Vi)/t
a = (25m/s - 5m/s)/10s
a = (20m/s)/10s
a = 2m/s2
What is the symbol and unit for power?
P
W (Watts)
What is the formula for acceleration?
a = (Vf - Vi)/t
What is the max amount of electrons found in the outer shell of an element in group 17?
7
Inertia
A 2 kg rock is rolling at 3 m/s. What is its kinetic energy?
KE = 1/2 mv2
KE = 1/2 (2kg)(3m/s)2
KE = 1/2 (2kg * 9m/s2)
KE = 9J
What is the symbol and units for momentum?
p
kg*m/s (kilograms x meters per second)
What is the formula for mass?
m = F/a
or
m = P/v
Which bond shares electrons between elements?
Covalent bond
When I tried to pull a toy away from my dog, we both pulled really hard and there was no motion. What does this say about our forces?
They were both balanced
A machine does 1200 J of work in 4 seconds. What is the power output?
P = W/t
P = 1200J/4s
P = 300 W